<html>
<META http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<head>
<title>Section 18.1.&nbsp; Introduction</title>
<link rel="STYLESHEET" type="text/css" href="images/style.css">
<link rel="STYLESHEET" type="text/css" href="images/docsafari.css">
</head>
<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr><td><div STYLE="MARGIN-LEFT: 0.15in;"><a href="toc.html"><img src="images/team.gif" width="60" height="17" border="0" align="absmiddle"  alt="Team BBL"></a></div></td>
<td align="right"><div STYLE="MARGIN-LEFT: 0.15in;">
<a href=ch18.html><img src="images/prev.gif" width="60" height="17" border="0" align="absmiddle" alt="Previous Page"></a>
<a href=ch18lev1sec2.html><img src="images/next.gif" width="60" height="17" border="0" align="absmiddle" alt="Next Page"></a>
</div></td></tr></table>
<br><table width="100%" border="0" cellspacing="0" cellpadding="0"><tr><td valign="top"><a name="ch18lev1sec1"></a>
<h3 class="docSection1Title" id="454331-900">18.1. Introduction</h3>
<p class="docText"><a name="idd1e132428"></a><a name="idd1e132433"></a><a name="idd1e132436"></a>The handling of terminal I/O is a messy area, regardless of the operating system. The UNIX System is no exception. The manual page for terminal I/O is usually one of the longest in most editions of the programmer's manuals.</P>
<p class="docText">With the UNIX System, a schism formed in the late 1970s when System III developed a different set of terminal routines from those of Version 7. The System III style of terminal I/O continued through System V, and the Version 7 style became the standard for the BSD-derived systems. As with signals, this difference between the two worlds has been conquered by POSIX.1. In this chapter, we look at all the POSIX.1 terminal functions and some of the platform-specific additions.</P>
<p class="docText">Part of the complexity of the terminal I/O system occurs because people use terminal I/O for so many different things: terminals, hardwired lines between computers, modems, printers, and so on.</p>

<UL></UL></TD></tr></table>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr><td><div STYLE="MARGIN-LEFT: 0.15in;"><a href="toc.html"><img src="images/team.gif" width="60" height="17" border="0" align="absmiddle"  alt="Team BBL"></a></div></td>
<td align="right"><div STYLE="MARGIN-LEFT: 0.15in;">
<a href=ch18.html><img src="images/prev.gif" width="60" height="17" border="0" align="absmiddle" alt="Previous Page"></a>
<a href=ch18lev1sec2.html><img src="images/next.gif" width="60" height="17" border="0" align="absmiddle" alt="Next Page"></a>
</div></td></tr></table>
</body></html><br>
<table width="100%" cellspacing="0" cellpadding="0"
style="margin-top: 0pt; border-collapse: collapse;"> 
<tr> <td align="right" style="background-color=white; border-top: 1px solid gray;"> 
<a href="http://www.zipghost.com/" target="_blank" style="font-family: Tahoma, Verdana;
 font-size: 11px; text-decoration: none;">The CHM file was converted to HTM by Trial version of <b>ChmD<!--99-->ecompiler</b>.</a>
</TD>
</TR><tr>
<td align="right" style="background-color=white; "> 
<a href="http://www.etextwizard.com/download/cd/cdsetup.exe" target="_blank" style="font-family: Tahoma, Verdana;
 font-size: 11px; text-decoration: none;">Download <b>ChmDec<!--99-->ompiler</b> at: http://www.zipghost.com</a>
</TD></tr></table>
